Hi Marie,
Firstly I'd like to offer my condolences, you have chosen a beautiful way to honour your late husband by bringing you family on this meaningful trip.
Regarding your accommodation search, I hope these tips will help narrow down the perfect place.
B&B Ireland is a great tool for private accommodations, Tynte House may be an interesting option for your party.
Besides Dublin, is there any city or region that holds your preference?
Best of luck with your search!
Megan